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This is fascinating. I think a really interesting project for someone (other than me) would be to collect each image, and have a whole bunch of people rate each one on a subjective scale from, let's say, 1 to 100. Then, draw a scatter plot of the ratings against time. I wonder what curves might show up? I also wonder whether there are any other datasets that might be used to determine if there's any common thread between learning processes like this.